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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be197a218748272c047fe1e7b4b3df54a8496ea54062920eaa1d28ba622706e' 
  AND token = 'c3c3Uwmw1UapAQsJqlD9Rh7gUh3zyyw4E93vHyKUBrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}